The development of the Watt governor for steam engines, which adapted the power output of the engine automatically to the load by means of feedback, … - Anthony Stafford Beer

The aim of management science is to display the best course of action in a given set of circumstances, and this must include all the circumstances.

According to the science of cybernetics, which deals with the topic of control in every kind of system (mechanical, electronic, biological, human, economic, and so on), there is a natural law that governs the capacity of a control system to work. It says that the control must be capable of generating as much "variety" as the situation to be controlled.

A slowly moving queue does not move uniformly. Rather, waves of motion pass down the queue. The frequency and amplitude of these waves is inversely related to the speed at which the queue is served.